采用聚合热解法制备了掺入3％ Al3+的富锂锰基Li[Lio,2Co0.13Ni0.13Mn0.51Al0.03]O2材料,经过X射线衍射(XRD)、扫描电镜(SEM)实验表明,掺入3％Al3+样品仍然保持层状结构,没有观察到杂质相的存在.在2.0～4.8 V范围内进行恒流充放电测试表明,掺A13+样品在30 mA/g的电流密度下,首周充放电比容量可达349.1和303.8 mAh/g(首次库仑效率87％);在1 00 mA/g的电流密度下,100次循环后,容量保持率为91.7％,显示出高的循环稳定性.这些结果表明掺杂A13+能够在一定程度上提高富锂氧化物材料层状结构的稳定性,为发展高容量和高稳定性正极材料提供一种新途径.
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